Process of making magnesium chlorid.



into sodium liyclrote i Sit) ufacturing cliloricls or the HUGH e.

Flo Drawing.

To aZZ whom it may come Be it known that T dent of Akron, in the co Sui mil; #11711 State oi Oliio l eve invented new us ful lmprovement in :rocesses of Melting Magiiesium liloritl, which zlie following is et'specificetion,

llliis invention relates to metliccl of man-- i ice ea rtli esium clil (1, o I'Qi Ml'fl so the like, to suitable treatment r of an alkaline earth me l ble decomposition, and magnesium in the ma t esium combining substance to magnesium ci loritl end else pro (lucing is. salt of the alkaline Wl ose chloricl is utilizccl in This is 2, simple reaction. and the materials used therein enable it to be carrier. out profitably for the production of chloride of this class, especially when it can be circled out in conjunction with the caustic soda and 2mm monia soda processes before referred to.

In producing caustic scale on a commer cial scale s common moths-i treats soda ash or sodium carbonate with lime (Coil), the mass action of the large quantity of water present converting the so( um. cerboimte ipiteting col on can also be material dolomite cium carbonate. r ct corned out with lime to containing magnesium,

such. as rock or mugncsitc WlHCll are ectively it compound ourbonltte of: calcium out sium and o carbonate cl The final protl cts of this pr soda and a solid. pre which contains tooth depemiiug" roc' s. magne- Letters l etcrtt.

PG tlillitlk fil tllft,

, 253, 153.5. Serial 3??0, 3,323.

'l. q is 3 M816. iii. 3611M Au. 3,822 tor e process for manufacturing magnesium, salts.

The precipitated magnesium carbonate, or the magnesia elozi, produced in connection with the caustic sods process described in said etiou, is treated With the proper amount 0 a solutioix of cliloricl of one of the alkaline earth metals such as calcium, barium or strontium chlcricl, The proportions magnesium carbonate or magnesia slim and cliloricl of the alkaline certlrmetal "will, of cos so, (lcpencl'upon the relative molecular weights of the two substances eninto the reaction and are calculated in advance. field. substences are mixed. to- {er ,1 longs vat or tank, which may be icli steam may be introflie reaction takes place more solution is warm and; usun carried out about boili119; temperature. it is also promoted if oarriecl out under pressure, and for this reason the mt or "enlaoreferebly sealed so as to enable the pressure therein to be raised above atmospheric, either by introducing steam. uncler pressure therein, or by heating it ex ternally to boiling temperature to generate stcun'i within the tank and thereby increase the pressure".

Vflieu this reaction is carried out for & suitable length of time preferably While agitating the material in said vat the clilorin of the-alkaline earth metal chlorid unites with the magnesium of the magnesium carbonate or magnesium alias, and. sinuiliencousiy the reaction protluces o corbon ute or :1 cerbmiete and liytlrute, of the elite.- line earth metal of which the cliloricl is used.

When the reaction is complete the superzuitent solution, containing the magnesium "JlllUFlCl is drawn off or is separated from s eruooretecl to the crystallizing operates to smell finely c ecoil" soluble.

q terboeete fusccl magnesium chlorid, at"

ll is any suitableand hydrate of the alkaline earth metal,

may be washed and dried and used 1n any suitable manneiysuch as" for whiting, filler or the like.

The method may be carried out very cheaply in connection with some other method which produces a chlorid of an alkaline earthmetal as a byproduct. One

. such method is that in common' use for the production of crude bicarbonate of soda, and known as the (ammonia; soda process. In said process a common salt solution is treated with carbonic acid and ammonia gases to form crude bicarbonate ofsoda, am:

monium chlorid and some ammonium carbonate. After separation of the crude bicarbonate the solution is treated in heated stills into which is introduced milk of lime for distilling v such ammonia gas as does not separate freely. These stills produce large quantities of what is usually considered a wasteproduct and which contains calcium carbonate, calcium hydrate and calciumand sodium ichlo ni d solution. This waste prod uct may be conducted to settling tanks in which the solid substances are separated, and the solution containing the calcium and sodium chlorid after the sodium chlorid is removed by evaporation, may be evaporated further or used directly in the production of magnesium chlorid in the mannerbefore .described. In casecalcium chlorid is used precipitates as usual.

and the substance initially treated is magnesia alba, containing both calcium carbonate and calcium hydrate, the reactions are asfollowsza The carbonate of the alkaline metal (calcium in this instance) produced by the first reaction, is wholly insoluble and therefore I The calcium hydrate produced by the second reaction is usually sparingly soluble in-water solutions, but in. the present method the magnesium chlorid in solution saturates the same so that the calcium hydrate is also wholly insoluble and therefore is wholly precipitated with the carbonate.

The method described is very simple and I can be carried'out with considerable profit,

particularly in connection with the caustic soda and ammonia soda processes. It is of particular value at the present time, due to the high cost of magnesium salts and the me ns relativel small supply produced in the United tates, In fact, magnesium salts in the past have been almost wholly imported from abroad, .due to the high cost of converting the magnesium into available form from native magnesiumbearing' rock such as is found in this country.

' What I claim is :-I- v 1. A process of producing magnesium chlorid, which COIlSlStS in heating under pressure a solution. of a chlorid of an alkaline earth'and the sludge resulting from causticizingsodium carbonate with a material containing magnesium hydroxid.

2. Aqprocess of producing 'magne sium chlorid, which consisting in digesting a mixture of calcium chlorid, water and the sludge resulting from causticizing sodium carbonate with a material containingmagnesium hydroxid.

A process of producing magnesium chlorid, which consists in heating under pressure a mixture of calcium chlorid, water and the sludge resulting from causticizing fio sodium carbonate with a material contain ing magnesium hydroxid.

4. A combined process for producing caustic soda and magnesium chlorid, which comprises causticizing sodium carbonate with a compound containing magnesium hydroxid to produce caustic soda, and

digesting the resulting sludge with a cal-' cium chlorid solution under heat and pressure to produce magnesium chlorid.

5. A process of producing magnesium chlorid, which consists in heating under 1 pressure the calcium chlorid liquor result- 

